1 /*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "Parcel"
18 //#define LOG_NDEBUG 0
19
20 #include <binder/Parcel.h>
21
22 #include <binder/IPCThreadState.h>
23 #include <binder/Binder.h>
24 #include <binder/BpBinder.h>
25 #include <binder/ProcessState.h>
26 #include <binder/TextOutput.h>
27
28 #include <errno.h>
29 #include <utils/Debug.h>
30 #include <utils/Log.h>
31 #include <utils/String8.h>
32 #include <utils/String16.h>
33 #include <utils/misc.h>
34 #include <utils/Flattenable.h>
35 #include <cutils/ashmem.h>
36
37 #include <private/binder/binder_module.h>
38 #include <private/binder/Static.h>
39
40 #include <inttypes.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <stdint.h>
44 #include <sys/mman.h>
45
46 #ifndef INT32_MAX
47 #define INT32_MAX ((int32_t)(2147483647))
48 #endif
49
50 #define LOG_REFS(...)
51 //#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
52 #define LOG_ALLOC(...)
53 //#define LOG_ALLOC(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__)
54
55 // ---------------------------------------------------------------------------
56
57 #define PAD_SIZE(s) (((s)+3)&~3)
58
59 // Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER
60 #define STRICT_MODE_PENALTY_GATHER 0x100
61
62 // Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER
63 #define EX_HAS_REPLY_HEADER -128
64
65 // Maximum size of a blob to transfer in-place.
66 static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024;
67
68 // XXX This can be made public if we want to provide
69 // support for typed data.
70 struct small_flat_data
71 {
72 uint32_t type;
73 uint32_t data;
74 };
75
76 namespace android {
77
78 static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER;
79 static size_t gParcelGlobalAllocSize = 0;
80 static size_t gParcelGlobalAllocCount = 0;
81
acquire_object(const sp<ProcessState> & proc,const flat_binder_object & obj,const void * who)82 void acquire_object(const sp<ProcessState>& proc,
83 const flat_binder_object& obj, const void* who)
84 {
85 switch (obj.type) {
86 case BINDER_TYPE_BINDER:
87 if (obj.binder) {
88 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie);
89 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who);
90 }
91 return;
92 case BINDER_TYPE_WEAK_BINDER:
93 if (obj.binder)
94 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who);
95 return;
96 case BINDER_TYPE_HANDLE: {
97 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
98 if (b != NULL) {
99 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
100 b->incStrong(who);
101 }
102 return;
103 }
104 case BINDER_TYPE_WEAK_HANDLE: {
105 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
106 if (b != NULL) b.get_refs()->incWeak(who);
107 return;
108 }
109 case BINDER_TYPE_FD: {
110 // intentionally blank -- nothing to do to acquire this, but we do
111 // recognize it as a legitimate object type.
112 return;
113 }
114 }
115
116 ALOGD("Invalid object type 0x%08x", obj.type);
117 }
118
release_object(const sp<ProcessState> & proc,const flat_binder_object & obj,const void * who)119 void release_object(const sp<ProcessState>& proc,
120 const flat_binder_object& obj, const void* who)
121 {
122 switch (obj.type) {
123 case BINDER_TYPE_BINDER:
124 if (obj.binder) {
125 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie);
126 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who);
127 }
128 return;
129 case BINDER_TYPE_WEAK_BINDER:
130 if (obj.binder)
131 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who);
132 return;
133 case BINDER_TYPE_HANDLE: {
134 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
135 if (b != NULL) {
136 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
137 b->decStrong(who);
138 }
139 return;
140 }
141 case BINDER_TYPE_WEAK_HANDLE: {
142 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
143 if (b != NULL) b.get_refs()->decWeak(who);
144 return;
145 }
146 case BINDER_TYPE_FD: {
147 if (obj.cookie != 0) close(obj.handle);
148 return;
149 }
150 }
151
152 ALOGE("Invalid object type 0x%08x", obj.type);
153 }
154
finish_flatten_binder(const sp<IBinder> &,const flat_binder_object & flat,Parcel * out)155 inline static status_t finish_flatten_binder(
156 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out)
157 {
158 return out->writeObject(flat, false);
159 }
160
flatten_binder(const sp<ProcessState> &,const sp<IBinder> & binder,Parcel * out)161 status_t flatten_binder(const sp<ProcessState>& /*proc*/,
162 const sp<IBinder>& binder, Parcel* out)
163 {
164 flat_binder_object obj;
165
166 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
167 if (binder != NULL) {
168 IBinder *local = binder->localBinder();
169 if (!local) {
170 BpBinder *proxy = binder->remoteBinder();
171 if (proxy == NULL) {
172 ALOGE("null proxy");
173 }
174 const int32_t handle = proxy ? proxy->handle() : 0;
175 obj.type = BINDER_TYPE_HANDLE;
176 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
177 obj.handle = handle;
178 obj.cookie = 0;
179 } else {
180 obj.type = BINDER_TYPE_BINDER;
181 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs());
182 obj.cookie = reinterpret_cast<uintptr_t>(local);
183 }
184 } else {
185 obj.type = BINDER_TYPE_BINDER;
186 obj.binder = 0;
187 obj.cookie = 0;
188 }
189
190 return finish_flatten_binder(binder, obj, out);
191 }
192
flatten_binder(const sp<ProcessState> &,const wp<IBinder> & binder,Parcel * out)193 status_t flatten_binder(const sp<ProcessState>& /*proc*/,
194 const wp<IBinder>& binder, Parcel* out)
195 {
196 flat_binder_object obj;
197
198 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
199 if (binder != NULL) {
200 sp<IBinder> real = binder.promote();
201 if (real != NULL) {
202 IBinder *local = real->localBinder();
203 if (!local) {
204 BpBinder *proxy = real->remoteBinder();
205 if (proxy == NULL) {
206 ALOGE("null proxy");
207 }
208 const int32_t handle = proxy ? proxy->handle() : 0;
209 obj.type = BINDER_TYPE_WEAK_HANDLE;
210 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
211 obj.handle = handle;
212 obj.cookie = 0;
213 } else {
214 obj.type = BINDER_TYPE_WEAK_BINDER;
215 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs());
216 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get());
217 }
218 return finish_flatten_binder(real, obj, out);
219 }
220
221 // XXX How to deal? In order to flatten the given binder,
222 // we need to probe it for information, which requires a primary
223 // reference... but we don't have one.
224 //
225 // The OpenBinder implementation uses a dynamic_cast<> here,
226 // but we can't do that with the different reference counting
227 // implementation we are using.
228 ALOGE("Unable to unflatten Binder weak reference!");
229 obj.type = BINDER_TYPE_BINDER;
230 obj.binder = 0;
231 obj.cookie = 0;
232 return finish_flatten_binder(NULL, obj, out);
233
234 } else {
235 obj.type = BINDER_TYPE_BINDER;
236 obj.binder = 0;
237 obj.cookie = 0;
238 return finish_flatten_binder(NULL, obj, out);
239 }
240 }
241
finish_unflatten_binder(BpBinder *,const flat_binder_object &,const Parcel &)242 inline static status_t finish_unflatten_binder(
243 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/,
244 const Parcel& /*in*/)
245 {
246 return NO_ERROR;
247 }
248
unflatten_binder(const sp<ProcessState> & proc,const Parcel & in,sp<IBinder> * out)249 status_t unflatten_binder(const sp<ProcessState>& proc,
250 const Parcel& in, sp<IBinder>* out)
251 {
252 const flat_binder_object* flat = in.readObject(false);
253
254 if (flat) {
255 switch (flat->type) {
256 case BINDER_TYPE_BINDER:
257 *out = reinterpret_cast<IBinder*>(flat->cookie);
258 return finish_unflatten_binder(NULL, *flat, in);
259 case BINDER_TYPE_HANDLE:
260 *out = proc->getStrongProxyForHandle(flat->handle);
261 return finish_unflatten_binder(
262 static_cast<BpBinder*>(out->get()), *flat, in);
263 }
264 }
265 return BAD_TYPE;
266 }
267
unflatten_binder(const sp<ProcessState> & proc,const Parcel & in,wp<IBinder> * out)268 status_t unflatten_binder(const sp<ProcessState>& proc,
269 const Parcel& in, wp<IBinder>* out)
270 {
271 const flat_binder_object* flat = in.readObject(false);
272
273 if (flat) {
274 switch (flat->type) {
275 case BINDER_TYPE_BINDER:
276 *out = reinterpret_cast<IBinder*>(flat->cookie);
277 return finish_unflatten_binder(NULL, *flat, in);
278 case BINDER_TYPE_WEAK_BINDER:
279 if (flat->binder != 0) {
280 out->set_object_and_refs(
281 reinterpret_cast<IBinder*>(flat->cookie),
282 reinterpret_cast<RefBase::weakref_type*>(flat->binder));
283 } else {
284 *out = NULL;
285 }
286 return finish_unflatten_binder(NULL, *flat, in);
287 case BINDER_TYPE_HANDLE:
288 case BINDER_TYPE_WEAK_HANDLE:
289 *out = proc->getWeakProxyForHandle(flat->handle);
290 return finish_unflatten_binder(
291 static_cast<BpBinder*>(out->unsafe_get()), *flat, in);
292 }
293 }
294 return BAD_TYPE;
295 }
296
297 // ---------------------------------------------------------------------------
298
Parcel()299 Parcel::Parcel()
300 {
301 LOG_ALLOC("Parcel %p: constructing", this);
302 initState();
303 }
304
~Parcel()305 Parcel::~Parcel()
306 {
307 freeDataNoInit();
308 LOG_ALLOC("Parcel %p: destroyed", this);
309 }
310
getGlobalAllocSize()311 size_t Parcel::getGlobalAllocSize() {
312 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
313 size_t size = gParcelGlobalAllocSize;
314 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
315 return size;
316 }
317
getGlobalAllocCount()318 size_t Parcel::getGlobalAllocCount() {
319 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
320 size_t count = gParcelGlobalAllocCount;
321 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
322 return count;
323 }
324
data() const325 const uint8_t* Parcel::data() const
326 {
327 return mData;
328 }
329
dataSize() const330 size_t Parcel::dataSize() const
331 {
332 return (mDataSize > mDataPos ? mDataSize : mDataPos);
333 }
334
dataAvail() const335 size_t Parcel::dataAvail() const
336 {
337 // TODO: decide what to do about the possibility that this can
338 // report an available-data size that exceeds a Java int's max
339 // positive value, causing havoc. Fortunately this will only
340 // happen if someone constructs a Parcel containing more than two
341 // gigabytes of data, which on typical phone hardware is simply
342 // not possible.
343 return dataSize() - dataPosition();
344 }
345
dataPosition() const346 size_t Parcel::dataPosition() const
347 {
348 return mDataPos;
349 }
350
dataCapacity() const351 size_t Parcel::dataCapacity() const
352 {
353 return mDataCapacity;
354 }
355
setDataSize(size_t size)356 status_t Parcel::setDataSize(size_t size)
357 {
358 status_t err;
359 err = continueWrite(size);
360 if (err == NO_ERROR) {
361 mDataSize = size;
362 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize);
363 }
364 return err;
365 }
366
setDataPosition(size_t pos) const367 void Parcel::setDataPosition(size_t pos) const
368 {
369 mDataPos = pos;
370 mNextObjectHint = 0;
371 }
372
setDataCapacity(size_t size)373 status_t Parcel::setDataCapacity(size_t size)
374 {
375 if (size > mDataCapacity) return continueWrite(size);
376 return NO_ERROR;
377 }
378
setData(const uint8_t * buffer,size_t len)379 status_t Parcel::setData(const uint8_t* buffer, size_t len)
380 {
381 status_t err = restartWrite(len);
382 if (err == NO_ERROR) {
383 memcpy(const_cast<uint8_t*>(data()), buffer, len);
384 mDataSize = len;
385 mFdsKnown = false;
386 }
387 return err;
388 }
389
appendFrom(const Parcel * parcel,size_t offset,size_t len)390 status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
391 {
392 const sp<ProcessState> proc(ProcessState::self());
393 status_t err;
394 const uint8_t *data = parcel->mData;
395 const binder_size_t *objects = parcel->mObjects;
396 size_t size = parcel->mObjectsSize;
397 int startPos = mDataPos;
398 int firstIndex = -1, lastIndex = -2;
399
400 if (len == 0) {
401 return NO_ERROR;
402 }
403
404 // range checks against the source parcel size
405 if ((offset > parcel->mDataSize)
406 || (len > parcel->mDataSize)
407 || (offset + len > parcel->mDataSize)) {
408 return BAD_VALUE;
409 }
410
411 // Count objects in range
412 for (int i = 0; i < (int) size; i++) {
413 size_t off = objects[i];
414 if ((off >= offset) && (off + sizeof(flat_binder_object) <= offset + len)) {
415 if (firstIndex == -1) {
416 firstIndex = i;
417 }
418 lastIndex = i;
419 }
420 }
421 int numObjects = lastIndex - firstIndex + 1;
422
423 if ((mDataSize+len) > mDataCapacity) {
424 // grow data
425 err = growData(len);
426 if (err != NO_ERROR) {
427 return err;
428 }
429 }
430
431 // append data
432 memcpy(mData + mDataPos, data + offset, len);
433 mDataPos += len;
434 mDataSize += len;
435
436 err = NO_ERROR;
437
438 if (numObjects > 0) {
439 // grow objects
440 if (mObjectsCapacity < mObjectsSize + numObjects) {
441 int newSize = ((mObjectsSize + numObjects)*3)/2;
442 binder_size_t *objects =
443 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
444 if (objects == (binder_size_t*)0) {
445 return NO_MEMORY;
446 }
447 mObjects = objects;
448 mObjectsCapacity = newSize;
449 }
450
451 // append and acquire objects
452 int idx = mObjectsSize;
453 for (int i = firstIndex; i <= lastIndex; i++) {
454 size_t off = objects[i] - offset + startPos;
455 mObjects[idx++] = off;
456 mObjectsSize++;
457
458 flat_binder_object* flat
459 = reinterpret_cast<flat_binder_object*>(mData + off);
460 acquire_object(proc, *flat, this);
461
462 if (flat->type == BINDER_TYPE_FD) {
463 // If this is a file descriptor, we need to dup it so the
464 // new Parcel now owns its own fd, and can declare that we
465 // officially know we have fds.
466 flat->handle = dup(flat->handle);
467 flat->cookie = 1;
468 mHasFds = mFdsKnown = true;
469 if (!mAllowFds) {
470 err = FDS_NOT_ALLOWED;
471 }
472 }
473 }
474 }
475
476 return err;
477 }
478
pushAllowFds(bool allowFds)479 bool Parcel::pushAllowFds(bool allowFds)
480 {
481 const bool origValue = mAllowFds;
482 if (!allowFds) {
483 mAllowFds = false;
484 }
485 return origValue;
486 }
487
restoreAllowFds(bool lastValue)488 void Parcel::restoreAllowFds(bool lastValue)
489 {
490 mAllowFds = lastValue;
491 }
492
hasFileDescriptors() const493 bool Parcel::hasFileDescriptors() const
494 {
495 if (!mFdsKnown) {
496 scanForFds();
497 }
498 return mHasFds;
499 }
500
501 // Write RPC headers. (previously just the interface token)
writeInterfaceToken(const String16 & interface)502 status_t Parcel::writeInterfaceToken(const String16& interface)
503 {
504 writeInt32(IPCThreadState::self()->getStrictModePolicy() |
505 STRICT_MODE_PENALTY_GATHER);
506 // currently the interface identification token is just its name as a string
507 return writeString16(interface);
508 }
509
checkInterface(IBinder * binder) const510 bool Parcel::checkInterface(IBinder* binder) const
511 {
512 return enforceInterface(binder->getInterfaceDescriptor());
513 }
514
enforceInterface(const String16 & interface,IPCThreadState * threadState) const515 bool Parcel::enforceInterface(const String16& interface,
516 IPCThreadState* threadState) const
517 {
518 int32_t strictPolicy = readInt32();
519 if (threadState == NULL) {
520 threadState = IPCThreadState::self();
521 }
522 if ((threadState->getLastTransactionBinderFlags() &
523 IBinder::FLAG_ONEWAY) != 0) {
524 // For one-way calls, the callee is running entirely
525 // disconnected from the caller, so disable StrictMode entirely.
526 // Not only does disk/network usage not impact the caller, but
527 // there's no way to commuicate back any violations anyway.
528 threadState->setStrictModePolicy(0);
529 } else {
530 threadState->setStrictModePolicy(strictPolicy);
531 }
532 const String16 str(readString16());
533 if (str == interface) {
534 return true;
535 } else {
536 ALOGW("**** enforceInterface() expected '%s' but read '%s'",
537 String8(interface).string(), String8(str).string());
538 return false;
539 }
540 }
541
objects() const542 const binder_size_t* Parcel::objects() const
543 {
544 return mObjects;
545 }
546
objectsCount() const547 size_t Parcel::objectsCount() const
548 {
549 return mObjectsSize;
550 }
551
errorCheck() const552 status_t Parcel::errorCheck() const
553 {
554 return mError;
555 }
556
setError(status_t err)557 void Parcel::setError(status_t err)
558 {
559 mError = err;
560 }
561
finishWrite(size_t len)562 status_t Parcel::finishWrite(size_t len)
563 {
564 //printf("Finish write of %d\n", len);
565 mDataPos += len;
566 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos);
567 if (mDataPos > mDataSize) {
568 mDataSize = mDataPos;
569 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize);
570 }
571 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize);
572 return NO_ERROR;
573 }
574
writeUnpadded(const void * data,size_t len)575 status_t Parcel::writeUnpadded(const void* data, size_t len)
576 {
577 size_t end = mDataPos + len;
578 if (end < mDataPos) {
579 // integer overflow
580 return BAD_VALUE;
581 }
582
583 if (end <= mDataCapacity) {
584 restart_write:
585 memcpy(mData+mDataPos, data, len);
586 return finishWrite(len);
587 }
588
589 status_t err = growData(len);
590 if (err == NO_ERROR) goto restart_write;
591 return err;
592 }
593
write(const void * data,size_t len)594 status_t Parcel::write(const void* data, size_t len)
595 {
596 void* const d = writeInplace(len);
597 if (d) {
598 memcpy(d, data, len);
599 return NO_ERROR;
600 }
601 return mError;
602 }
603
writeInplace(size_t len)604 void* Parcel::writeInplace(size_t len)
605 {
606 const size_t padded = PAD_SIZE(len);
607
608 // sanity check for integer overflow
609 if (mDataPos+padded < mDataPos) {
610 return NULL;
611 }
612
613 if ((mDataPos+padded) <= mDataCapacity) {
614 restart_write:
615 //printf("Writing %ld bytes, padded to %ld\n", len, padded);
616 uint8_t* const data = mData+mDataPos;
617
618 // Need to pad at end?
619 if (padded != len) {
620 #if BYTE_ORDER == BIG_ENDIAN
621 static const uint32_t mask[4] = {
622 0x00000000, 0xffffff00, 0xffff0000, 0xff000000
623 };
624 #endif
625 #if BYTE_ORDER == LITTLE_ENDIAN
626 static const uint32_t mask[4] = {
627 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff
628 };
629 #endif
630 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len],
631 // *reinterpret_cast<void**>(data+padded-4));
632 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len];
633 }
634
635 finishWrite(padded);
636 return data;
637 }
638
639 status_t err = growData(padded);
640 if (err == NO_ERROR) goto restart_write;
641 return NULL;
642 }
643
writeInt32(int32_t val)644 status_t Parcel::writeInt32(int32_t val)
645 {
646 return writeAligned(val);
647 }
writeInt32Array(size_t len,const int32_t * val)648 status_t Parcel::writeInt32Array(size_t len, const int32_t *val) {
649 if (!val) {
650 return writeAligned(-1);
651 }
652 status_t ret = writeAligned(len);
653 if (ret == NO_ERROR) {
654 ret = write(val, len * sizeof(*val));
655 }
656 return ret;
657 }
writeByteArray(size_t len,const uint8_t * val)658 status_t Parcel::writeByteArray(size_t len, const uint8_t *val) {
659 if (!val) {
660 return writeAligned(-1);
661 }
662 status_t ret = writeAligned(len);
663 if (ret == NO_ERROR) {
664 ret = write(val, len * sizeof(*val));
665 }
666 return ret;
667 }
668
writeInt64(int64_t val)669 status_t Parcel::writeInt64(int64_t val)
670 {
671 return writeAligned(val);
672 }
673
writePointer(uintptr_t val)674 status_t Parcel::writePointer(uintptr_t val)
675 {
676 return writeAligned<binder_uintptr_t>(val);
677 }
678
writeFloat(float val)679 status_t Parcel::writeFloat(float val)
680 {
681 return writeAligned(val);
682 }
683
684 #if defined(__mips__) && defined(__mips_hard_float)
685
writeDouble(double val)686 status_t Parcel::writeDouble(double val)
687 {
688 union {
689 double d;
690 unsigned long long ll;
691 } u;
692 u.d = val;
693 return writeAligned(u.ll);
694 }
695
696 #else
697
writeDouble(double val)698 status_t Parcel::writeDouble(double val)
699 {
700 return writeAligned(val);
701 }
702
703 #endif
704
writeCString(const char * str)705 status_t Parcel::writeCString(const char* str)
706 {
707 return write(str, strlen(str)+1);
708 }
709
writeString8(const String8 & str)710 status_t Parcel::writeString8(const String8& str)
711 {
712 status_t err = writeInt32(str.bytes());
713 // only write string if its length is more than zero characters,
714 // as readString8 will only read if the length field is non-zero.
715 // this is slightly different from how writeString16 works.
716 if (str.bytes() > 0 && err == NO_ERROR) {
717 err = write(str.string(), str.bytes()+1);
718 }
719 return err;
720 }
721
writeString16(const String16 & str)722 status_t Parcel::writeString16(const String16& str)
723 {
724 return writeString16(str.string(), str.size());
725 }
726
writeString16(const char16_t * str,size_t len)727 status_t Parcel::writeString16(const char16_t* str, size_t len)
728 {
729 if (str == NULL) return writeInt32(-1);
730
731 status_t err = writeInt32(len);
732 if (err == NO_ERROR) {
733 len *= sizeof(char16_t);
734 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t));
735 if (data) {
736 memcpy(data, str, len);
737 *reinterpret_cast<char16_t*>(data+len) = 0;
738 return NO_ERROR;
739 }
740 err = mError;
741 }
742 return err;
743 }
744
writeStrongBinder(const sp<IBinder> & val)745 status_t Parcel::writeStrongBinder(const sp<IBinder>& val)
746 {
747 return flatten_binder(ProcessState::self(), val, this);
748 }
749
writeWeakBinder(const wp<IBinder> & val)750 status_t Parcel::writeWeakBinder(const wp<IBinder>& val)
751 {
752 return flatten_binder(ProcessState::self(), val, this);
753 }
754
writeNativeHandle(const native_handle * handle)755 status_t Parcel::writeNativeHandle(const native_handle* handle)
756 {
757 if (!handle || handle->version != sizeof(native_handle))
758 return BAD_TYPE;
759
760 status_t err;
761 err = writeInt32(handle->numFds);
762 if (err != NO_ERROR) return err;
763
764 err = writeInt32(handle->numInts);
765 if (err != NO_ERROR) return err;
766
767 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++)
768 err = writeDupFileDescriptor(handle->data[i]);
769
770 if (err != NO_ERROR) {
771 ALOGD("write native handle, write dup fd failed");
772 return err;
773 }
774 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts);
775 return err;
776 }
777
writeFileDescriptor(int fd,bool takeOwnership)778 status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership)
779 {
780 flat_binder_object obj;
781 obj.type = BINDER_TYPE_FD;
782 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
783 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */
784 obj.handle = fd;
785 obj.cookie = takeOwnership ? 1 : 0;
786 return writeObject(obj, true);
787 }
788
writeDupFileDescriptor(int fd)789 status_t Parcel::writeDupFileDescriptor(int fd)
790 {
791 int dupFd = dup(fd);
792 if (dupFd < 0) {
793 return -errno;
794 }
795 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/);
796 if (err) {
797 close(dupFd);
798 }
799 return err;
800 }
801
802 // WARNING: This method must stay in sync with
803 // Parcelable.Creator<ParcelFileDescriptor> CREATOR
804 // in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
writeParcelFileDescriptor(int fd,int commChannel)805 status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) {
806 status_t status;
807
808 if (fd < 0) {
809 status = writeInt32(0); // ParcelFileDescriptor is null
810 if (status) return status;
811 } else {
812 status = writeInt32(1); // ParcelFileDescriptor is not null
813 if (status) return status;
814 status = writeDupFileDescriptor(fd);
815 if (status) return status;
816 if (commChannel < 0) {
817 status = writeInt32(0); // commChannel is null
818 if (status) return status;
819 } else {
820 status = writeInt32(1); // commChannel is not null
821 if (status) return status;
822 status = writeDupFileDescriptor(commChannel);
823 }
824 }
825 return status;
826 }
827
writeBlob(size_t len,WritableBlob * outBlob)828 status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
829 {
830 status_t status;
831
832 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) {
833 ALOGV("writeBlob: write in place");
834 status = writeInt32(0);
835 if (status) return status;
836
837 void* ptr = writeInplace(len);
838 if (!ptr) return NO_MEMORY;
839
840 outBlob->init(false /*mapped*/, ptr, len);
841 return NO_ERROR;
842 }
843
844 ALOGV("writeBlob: write to ashmem");
845 int fd = ashmem_create_region("Parcel Blob", len);
846 if (fd < 0) return NO_MEMORY;
847
848 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
849 if (result < 0) {
850 status = result;
851 } else {
852 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
853 if (ptr == MAP_FAILED) {
854 status = -errno;
855 } else {
856 result = ashmem_set_prot_region(fd, PROT_READ);
857 if (result < 0) {
858 status = result;
859 } else {
860 status = writeInt32(1);
861 if (!status) {
862 status = writeFileDescriptor(fd, true /*takeOwnership*/);
863 if (!status) {
864 outBlob->init(true /*mapped*/, ptr, len);
865 return NO_ERROR;
866 }
867 }
868 }
869 }
870 ::munmap(ptr, len);
871 }
872 ::close(fd);
873 return status;
874 }
875
write(const FlattenableHelperInterface & val)876 status_t Parcel::write(const FlattenableHelperInterface& val)
877 {
878 status_t err;
879
880 // size if needed
881 const size_t len = val.getFlattenedSize();
882 const size_t fd_count = val.getFdCount();
883
884 err = this->writeInt32(len);
885 if (err) return err;
886
887 err = this->writeInt32(fd_count);
888 if (err) return err;
889
890 // payload
891 void* const buf = this->writeInplace(PAD_SIZE(len));
892 if (buf == NULL)
893 return BAD_VALUE;
894
895 int* fds = NULL;
896 if (fd_count) {
897 fds = new int[fd_count];
898 }
899
900 err = val.flatten(buf, len, fds, fd_count);
901 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
902 err = this->writeDupFileDescriptor( fds[i] );
903 }
904
905 if (fd_count) {
906 delete [] fds;
907 }
908
909 return err;
910 }
911
writeObject(const flat_binder_object & val,bool nullMetaData)912 status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData)
913 {
914 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity;
915 const bool enoughObjects = mObjectsSize < mObjectsCapacity;
916 if (enoughData && enoughObjects) {
917 restart_write:
918 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val;
919
920 // Need to write meta-data?
921 if (nullMetaData || val.binder != 0) {
922 mObjects[mObjectsSize] = mDataPos;
923 acquire_object(ProcessState::self(), val, this);
924 mObjectsSize++;
925 }
926
927 // remember if it's a file descriptor
928 if (val.type == BINDER_TYPE_FD) {
929 if (!mAllowFds) {
930 return FDS_NOT_ALLOWED;
931 }
932 mHasFds = mFdsKnown = true;
933 }
934
935 return finishWrite(sizeof(flat_binder_object));
936 }
937
938 if (!enoughData) {
939 const status_t err = growData(sizeof(val));
940 if (err != NO_ERROR) return err;
941 }
942 if (!enoughObjects) {
943 size_t newSize = ((mObjectsSize+2)*3)/2;
944 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
945 if (objects == NULL) return NO_MEMORY;
946 mObjects = objects;
947 mObjectsCapacity = newSize;
948 }
949
950 goto restart_write;
951 }
952
writeNoException()953 status_t Parcel::writeNoException()
954 {
955 return writeInt32(0);
956 }
957
remove(size_t,size_t)958 void Parcel::remove(size_t /*start*/, size_t /*amt*/)
959 {
960 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!");
961 }
962
read(void * outData,size_t len) const963 status_t Parcel::read(void* outData, size_t len) const
964 {
965 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
966 && len <= PAD_SIZE(len)) {
967 memcpy(outData, mData+mDataPos, len);
968 mDataPos += PAD_SIZE(len);
969 ALOGV("read Setting data pos of %p to %zu", this, mDataPos);
970 return NO_ERROR;
971 }
972 return NOT_ENOUGH_DATA;
973 }
974
readInplace(size_t len) const975 const void* Parcel::readInplace(size_t len) const
976 {
977 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize
978 && len <= PAD_SIZE(len)) {
979 const void* data = mData+mDataPos;
980 mDataPos += PAD_SIZE(len);
981 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
982 return data;
983 }
984 return NULL;
985 }
986
987 template<class T>
readAligned(T * pArg) const988 status_t Parcel::readAligned(T *pArg) const {
989 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
990
991 if ((mDataPos+sizeof(T)) <= mDataSize) {
992 const void* data = mData+mDataPos;
993 mDataPos += sizeof(T);
994 *pArg = *reinterpret_cast<const T*>(data);
995 return NO_ERROR;
996 } else {
997 return NOT_ENOUGH_DATA;
998 }
999 }
1000
1001 template<class T>
readAligned() const1002 T Parcel::readAligned() const {
1003 T result;
1004 if (readAligned(&result) != NO_ERROR) {
1005 result = 0;
1006 }
1007
1008 return result;
1009 }
1010
1011 template<class T>
writeAligned(T val)1012 status_t Parcel::writeAligned(T val) {
1013 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T));
1014
1015 if ((mDataPos+sizeof(val)) <= mDataCapacity) {
1016 restart_write:
1017 *reinterpret_cast<T*>(mData+mDataPos) = val;
1018 return finishWrite(sizeof(val));
1019 }
1020
1021 status_t err = growData(sizeof(val));
1022 if (err == NO_ERROR) goto restart_write;
1023 return err;
1024 }
1025
readInt32(int32_t * pArg) const1026 status_t Parcel::readInt32(int32_t *pArg) const
1027 {
1028 return readAligned(pArg);
1029 }
1030
readInt32() const1031 int32_t Parcel::readInt32() const
1032 {
1033 return readAligned<int32_t>();
1034 }
1035
1036
readInt64(int64_t * pArg) const1037 status_t Parcel::readInt64(int64_t *pArg) const
1038 {
1039 return readAligned(pArg);
1040 }
1041
1042
readInt64() const1043 int64_t Parcel::readInt64() const
1044 {
1045 return readAligned<int64_t>();
1046 }
1047
readPointer(uintptr_t * pArg) const1048 status_t Parcel::readPointer(uintptr_t *pArg) const
1049 {
1050 status_t ret;
1051 binder_uintptr_t ptr;
1052 ret = readAligned(&ptr);
1053 if (!ret)
1054 *pArg = ptr;
1055 return ret;
1056 }
1057
readPointer() const1058 uintptr_t Parcel::readPointer() const
1059 {
1060 return readAligned<binder_uintptr_t>();
1061 }
1062
1063
readFloat(float * pArg) const1064 status_t Parcel::readFloat(float *pArg) const
1065 {
1066 return readAligned(pArg);
1067 }
1068
1069
readFloat() const1070 float Parcel::readFloat() const
1071 {
1072 return readAligned<float>();
1073 }
1074
1075 #if defined(__mips__) && defined(__mips_hard_float)
1076
readDouble(double * pArg) const1077 status_t Parcel::readDouble(double *pArg) const
1078 {
1079 union {
1080 double d;
1081 unsigned long long ll;
1082 } u;
1083 u.d = 0;
1084 status_t status;
1085 status = readAligned(&u.ll);
1086 *pArg = u.d;
1087 return status;
1088 }
1089
readDouble() const1090 double Parcel::readDouble() const
1091 {
1092 union {
1093 double d;
1094 unsigned long long ll;
1095 } u;
1096 u.ll = readAligned<unsigned long long>();
1097 return u.d;
1098 }
1099
1100 #else
1101
readDouble(double * pArg) const1102 status_t Parcel::readDouble(double *pArg) const
1103 {
1104 return readAligned(pArg);
1105 }
1106
readDouble() const1107 double Parcel::readDouble() const
1108 {
1109 return readAligned<double>();
1110 }
1111
1112 #endif
1113
readIntPtr(intptr_t * pArg) const1114 status_t Parcel::readIntPtr(intptr_t *pArg) const
1115 {
1116 return readAligned(pArg);
1117 }
1118
1119
readIntPtr() const1120 intptr_t Parcel::readIntPtr() const
1121 {
1122 return readAligned<intptr_t>();
1123 }
1124
1125
readCString() const1126 const char* Parcel::readCString() const
1127 {
1128 const size_t avail = mDataSize-mDataPos;
1129 if (avail > 0) {
1130 const char* str = reinterpret_cast<const char*>(mData+mDataPos);
1131 // is the string's trailing NUL within the parcel's valid bounds?
1132 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail));
1133 if (eos) {
1134 const size_t len = eos - str;
1135 mDataPos += PAD_SIZE(len+1);
1136 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos);
1137 return str;
1138 }
1139 }
1140 return NULL;
1141 }
1142
readString8() const1143 String8 Parcel::readString8() const
1144 {
1145 int32_t size = readInt32();
1146 // watch for potential int overflow adding 1 for trailing NUL
1147 if (size > 0 && size < INT32_MAX) {
1148 const char* str = (const char*)readInplace(size+1);
1149 if (str) return String8(str, size);
1150 }
1151 return String8();
1152 }
1153
readString16() const1154 String16 Parcel::readString16() const
1155 {
1156 size_t len;
1157 const char16_t* str = readString16Inplace(&len);
1158 if (str) return String16(str, len);
1159 ALOGE("Reading a NULL string not supported here.");
1160 return String16();
1161 }
1162
readString16Inplace(size_t * outLen) const1163 const char16_t* Parcel::readString16Inplace(size_t* outLen) const
1164 {
1165 int32_t size = readInt32();
1166 // watch for potential int overflow from size+1
1167 if (size >= 0 && size < INT32_MAX) {
1168 *outLen = size;
1169 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
1170 if (str != NULL) {
1171 return str;
1172 }
1173 }
1174 *outLen = 0;
1175 return NULL;
1176 }
1177
readStrongBinder() const1178 sp<IBinder> Parcel::readStrongBinder() const
1179 {
1180 sp<IBinder> val;
1181 unflatten_binder(ProcessState::self(), *this, &val);
1182 return val;
1183 }
1184
readWeakBinder() const1185 wp<IBinder> Parcel::readWeakBinder() const
1186 {
1187 wp<IBinder> val;
1188 unflatten_binder(ProcessState::self(), *this, &val);
1189 return val;
1190 }
1191
readExceptionCode() const1192 int32_t Parcel::readExceptionCode() const
1193 {
1194 int32_t exception_code = readAligned<int32_t>();
1195 if (exception_code == EX_HAS_REPLY_HEADER) {
1196 int32_t header_start = dataPosition();
1197 int32_t header_size = readAligned<int32_t>();
1198 // Skip over fat responses headers. Not used (or propagated) in
1199 // native code
1200 setDataPosition(header_start + header_size);
1201 // And fat response headers are currently only used when there are no
1202 // exceptions, so return no error:
1203 return 0;
1204 }
1205 return exception_code;
1206 }
1207
readNativeHandle() const1208 native_handle* Parcel::readNativeHandle() const
1209 {
1210 int numFds, numInts;
1211 status_t err;
1212 err = readInt32(&numFds);
1213 if (err != NO_ERROR) return 0;
1214 err = readInt32(&numInts);
1215 if (err != NO_ERROR) return 0;
1216
1217 native_handle* h = native_handle_create(numFds, numInts);
1218 if (!h) {
1219 return 0;
1220 }
1221
1222 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
1223 h->data[i] = dup(readFileDescriptor());
1224 if (h->data[i] < 0) err = BAD_VALUE;
1225 }
1226 err = read(h->data + numFds, sizeof(int)*numInts);
1227 if (err != NO_ERROR) {
1228 native_handle_close(h);
1229 native_handle_delete(h);
1230 h = 0;
1231 }
1232 return h;
1233 }
1234
1235
readFileDescriptor() const1236 int Parcel::readFileDescriptor() const
1237 {
1238 const flat_binder_object* flat = readObject(true);
1239 if (flat) {
1240 switch (flat->type) {
1241 case BINDER_TYPE_FD:
1242 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this);
1243 return flat->handle;
1244 }
1245 }
1246 return BAD_TYPE;
1247 }
1248
1249 // WARNING: This method must stay in sync with writeToParcel()
1250 // in frameworks/base/core/java/android/os/ParcelFileDescriptor.java
readParcelFileDescriptor(int & outCommChannel) const1251 int Parcel::readParcelFileDescriptor(int& outCommChannel) const {
1252 int fd;
1253 outCommChannel = -1;
1254
1255 if (readInt32() == 0) {
1256 fd = -1;
1257 } else {
1258 fd = readFileDescriptor();
1259 if (fd >= 0 && readInt32() != 0) {
1260 outCommChannel = readFileDescriptor();
1261 }
1262 }
1263 return fd;
1264 }
1265
readBlob(size_t len,ReadableBlob * outBlob) const1266 status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
1267 {
1268 int32_t useAshmem;
1269 status_t status = readInt32(&useAshmem);
1270 if (status) return status;
1271
1272 if (!useAshmem) {
1273 ALOGV("readBlob: read in place");
1274 const void* ptr = readInplace(len);
1275 if (!ptr) return BAD_VALUE;
1276
1277 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len);
1278 return NO_ERROR;
1279 }
1280
1281 ALOGV("readBlob: read from ashmem");
1282 int fd = readFileDescriptor();
1283 if (fd == int(BAD_TYPE)) return BAD_VALUE;
1284
1285 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
1286 if (ptr == MAP_FAILED) return NO_MEMORY;
1287
1288 outBlob->init(true /*mapped*/, ptr, len);
1289 return NO_ERROR;
1290 }
1291
read(FlattenableHelperInterface & val) const1292 status_t Parcel::read(FlattenableHelperInterface& val) const
1293 {
1294 // size
1295 const size_t len = this->readInt32();
1296 const size_t fd_count = this->readInt32();
1297
1298 // payload
1299 void const* const buf = this->readInplace(PAD_SIZE(len));
1300 if (buf == NULL)
1301 return BAD_VALUE;
1302
1303 int* fds = NULL;
1304 if (fd_count) {
1305 fds = new int[fd_count];
1306 }
1307
1308 status_t err = NO_ERROR;
1309 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) {
1310 fds[i] = dup(this->readFileDescriptor());
1311 if (fds[i] < 0) {
1312 err = BAD_VALUE;
1313 ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s",
1314 i, fds[i], fd_count, strerror(errno));
1315 }
1316 }
1317
1318 if (err == NO_ERROR) {
1319 err = val.unflatten(buf, len, fds, fd_count);
1320 }
1321
1322 if (fd_count) {
1323 delete [] fds;
1324 }
1325
1326 return err;
1327 }
readObject(bool nullMetaData) const1328 const flat_binder_object* Parcel::readObject(bool nullMetaData) const
1329 {
1330 const size_t DPOS = mDataPos;
1331 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) {
1332 const flat_binder_object* obj
1333 = reinterpret_cast<const flat_binder_object*>(mData+DPOS);
1334 mDataPos = DPOS + sizeof(flat_binder_object);
1335 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) {
1336 // When transferring a NULL object, we don't write it into
1337 // the object list, so we don't want to check for it when
1338 // reading.
1339 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1340 return obj;
1341 }
1342
1343 // Ensure that this object is valid...
1344 binder_size_t* const OBJS = mObjects;
1345 const size_t N = mObjectsSize;
1346 size_t opos = mNextObjectHint;
1347
1348 if (N > 0) {
1349 ALOGV("Parcel %p looking for obj at %zu, hint=%zu",
1350 this, DPOS, opos);
1351
1352 // Start at the current hint position, looking for an object at
1353 // the current data position.
1354 if (opos < N) {
1355 while (opos < (N-1) && OBJS[opos] < DPOS) {
1356 opos++;
1357 }
1358 } else {
1359 opos = N-1;
1360 }
1361 if (OBJS[opos] == DPOS) {
1362 // Found it!
1363 ALOGV("Parcel %p found obj %zu at index %zu with forward search",
1364 this, DPOS, opos);
1365 mNextObjectHint = opos+1;
1366 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1367 return obj;
1368 }
1369
1370 // Look backwards for it...
1371 while (opos > 0 && OBJS[opos] > DPOS) {
1372 opos--;
1373 }
1374 if (OBJS[opos] == DPOS) {
1375 // Found it!
1376 ALOGV("Parcel %p found obj %zu at index %zu with backward search",
1377 this, DPOS, opos);
1378 mNextObjectHint = opos+1;
1379 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos);
1380 return obj;
1381 }
1382 }
1383 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
1384 this, DPOS);
1385 }
1386 return NULL;
1387 }
1388
closeFileDescriptors()1389 void Parcel::closeFileDescriptors()
1390 {
1391 size_t i = mObjectsSize;
1392 if (i > 0) {
1393 //ALOGI("Closing file descriptors for %zu objects...", i);
1394 }
1395 while (i > 0) {
1396 i--;
1397 const flat_binder_object* flat
1398 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1399 if (flat->type == BINDER_TYPE_FD) {
1400 //ALOGI("Closing fd: %ld", flat->handle);
1401 close(flat->handle);
1402 }
1403 }
1404 }
1405
ipcData() const1406 uintptr_t Parcel::ipcData() const
1407 {
1408 return reinterpret_cast<uintptr_t>(mData);
1409 }
1410
ipcDataSize() const1411 size_t Parcel::ipcDataSize() const
1412 {
1413 return (mDataSize > mDataPos ? mDataSize : mDataPos);
1414 }
1415
ipcObjects() const1416 uintptr_t Parcel::ipcObjects() const
1417 {
1418 return reinterpret_cast<uintptr_t>(mObjects);
1419 }
1420
ipcObjectsCount() const1421 size_t Parcel::ipcObjectsCount() const
1422 {
1423 return mObjectsSize;
1424 }
1425
ipcSetDataReference(const uint8_t * data,size_t dataSize,const binder_size_t * objects,size_t objectsCount,release_func relFunc,void * relCookie)1426 void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize,
1427 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie)
1428 {
1429 binder_size_t minOffset = 0;
1430 freeDataNoInit();
1431 mError = NO_ERROR;
1432 mData = const_cast<uint8_t*>(data);
1433 mDataSize = mDataCapacity = dataSize;
1434 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid());
1435 mDataPos = 0;
1436 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos);
1437 mObjects = const_cast<binder_size_t*>(objects);
1438 mObjectsSize = mObjectsCapacity = objectsCount;
1439 mNextObjectHint = 0;
1440 mOwner = relFunc;
1441 mOwnerCookie = relCookie;
1442 for (size_t i = 0; i < mObjectsSize; i++) {
1443 binder_size_t offset = mObjects[i];
1444 if (offset < minOffset) {
1445 ALOGE("%s: bad object offset %"PRIu64" < %"PRIu64"\n",
1446 __func__, (uint64_t)offset, (uint64_t)minOffset);
1447 mObjectsSize = 0;
1448 break;
1449 }
1450 minOffset = offset + sizeof(flat_binder_object);
1451 }
1452 scanForFds();
1453 }
1454
print(TextOutput & to,uint32_t) const1455 void Parcel::print(TextOutput& to, uint32_t /*flags*/) const
1456 {
1457 to << "Parcel(";
1458
1459 if (errorCheck() != NO_ERROR) {
1460 const status_t err = errorCheck();
1461 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\"";
1462 } else if (dataSize() > 0) {
1463 const uint8_t* DATA = data();
1464 to << indent << HexDump(DATA, dataSize()) << dedent;
1465 const binder_size_t* OBJS = objects();
1466 const size_t N = objectsCount();
1467 for (size_t i=0; i<N; i++) {
1468 const flat_binder_object* flat
1469 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]);
1470 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": "
1471 << TypeCode(flat->type & 0x7f7f7f00)
1472 << " = " << flat->binder;
1473 }
1474 } else {
1475 to << "NULL";
1476 }
1477
1478 to << ")";
1479 }
1480
releaseObjects()1481 void Parcel::releaseObjects()
1482 {
1483 const sp<ProcessState> proc(ProcessState::self());
1484 size_t i = mObjectsSize;
1485 uint8_t* const data = mData;
1486 binder_size_t* const objects = mObjects;
1487 while (i > 0) {
1488 i--;
1489 const flat_binder_object* flat
1490 = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1491 release_object(proc, *flat, this);
1492 }
1493 }
1494
acquireObjects()1495 void Parcel::acquireObjects()
1496 {
1497 const sp<ProcessState> proc(ProcessState::self());
1498 size_t i = mObjectsSize;
1499 uint8_t* const data = mData;
1500 binder_size_t* const objects = mObjects;
1501 while (i > 0) {
1502 i--;
1503 const flat_binder_object* flat
1504 = reinterpret_cast<flat_binder_object*>(data+objects[i]);
1505 acquire_object(proc, *flat, this);
1506 }
1507 }
1508
freeData()1509 void Parcel::freeData()
1510 {
1511 freeDataNoInit();
1512 initState();
1513 }
1514
freeDataNoInit()1515 void Parcel::freeDataNoInit()
1516 {
1517 if (mOwner) {
1518 LOG_ALLOC("Parcel %p: freeing other owner data", this);
1519 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1520 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1521 } else {
1522 LOG_ALLOC("Parcel %p: freeing allocated data", this);
1523 releaseObjects();
1524 if (mData) {
1525 LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity);
1526 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1527 gParcelGlobalAllocSize -= mDataCapacity;
1528 gParcelGlobalAllocCount--;
1529 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1530 free(mData);
1531 }
1532 if (mObjects) free(mObjects);
1533 }
1534 }
1535
growData(size_t len)1536 status_t Parcel::growData(size_t len)
1537 {
1538 size_t newSize = ((mDataSize+len)*3)/2;
1539 return (newSize <= mDataSize)
1540 ? (status_t) NO_MEMORY
1541 : continueWrite(newSize);
1542 }
1543
restartWrite(size_t desired)1544 status_t Parcel::restartWrite(size_t desired)
1545 {
1546 if (mOwner) {
1547 freeData();
1548 return continueWrite(desired);
1549 }
1550
1551 uint8_t* data = (uint8_t*)realloc(mData, desired);
1552 if (!data && desired > mDataCapacity) {
1553 mError = NO_MEMORY;
1554 return NO_MEMORY;
1555 }
1556
1557 releaseObjects();
1558
1559 if (data) {
1560 LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired);
1561 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1562 gParcelGlobalAllocSize += desired;
1563 gParcelGlobalAllocSize -= mDataCapacity;
1564 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1565 mData = data;
1566 mDataCapacity = desired;
1567 }
1568
1569 mDataSize = mDataPos = 0;
1570 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize);
1571 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos);
1572
1573 free(mObjects);
1574 mObjects = NULL;
1575 mObjectsSize = mObjectsCapacity = 0;
1576 mNextObjectHint = 0;
1577 mHasFds = false;
1578 mFdsKnown = true;
1579 mAllowFds = true;
1580
1581 return NO_ERROR;
1582 }
1583
continueWrite(size_t desired)1584 status_t Parcel::continueWrite(size_t desired)
1585 {
1586 // If shrinking, first adjust for any objects that appear
1587 // after the new data size.
1588 size_t objectsSize = mObjectsSize;
1589 if (desired < mDataSize) {
1590 if (desired == 0) {
1591 objectsSize = 0;
1592 } else {
1593 while (objectsSize > 0) {
1594 if (mObjects[objectsSize-1] < desired)
1595 break;
1596 objectsSize--;
1597 }
1598 }
1599 }
1600
1601 if (mOwner) {
1602 // If the size is going to zero, just release the owner's data.
1603 if (desired == 0) {
1604 freeData();
1605 return NO_ERROR;
1606 }
1607
1608 // If there is a different owner, we need to take
1609 // posession.
1610 uint8_t* data = (uint8_t*)malloc(desired);
1611 if (!data) {
1612 mError = NO_MEMORY;
1613 return NO_MEMORY;
1614 }
1615 binder_size_t* objects = NULL;
1616
1617 if (objectsSize) {
1618 objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t));
1619 if (!objects) {
1620 free(data);
1621
1622 mError = NO_MEMORY;
1623 return NO_MEMORY;
1624 }
1625
1626 // Little hack to only acquire references on objects
1627 // we will be keeping.
1628 size_t oldObjectsSize = mObjectsSize;
1629 mObjectsSize = objectsSize;
1630 acquireObjects();
1631 mObjectsSize = oldObjectsSize;
1632 }
1633
1634 if (mData) {
1635 memcpy(data, mData, mDataSize < desired ? mDataSize : desired);
1636 }
1637 if (objects && mObjects) {
1638 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t));
1639 }
1640 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
1641 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
1642 mOwner = NULL;
1643
1644 LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired);
1645 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1646 gParcelGlobalAllocSize += desired;
1647 gParcelGlobalAllocCount++;
1648 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1649
1650 mData = data;
1651 mObjects = objects;
1652 mDataSize = (mDataSize < desired) ? mDataSize : desired;
1653 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1654 mDataCapacity = desired;
1655 mObjectsSize = mObjectsCapacity = objectsSize;
1656 mNextObjectHint = 0;
1657
1658 } else if (mData) {
1659 if (objectsSize < mObjectsSize) {
1660 // Need to release refs on any objects we are dropping.
1661 const sp<ProcessState> proc(ProcessState::self());
1662 for (size_t i=objectsSize; i<mObjectsSize; i++) {
1663 const flat_binder_object* flat
1664 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]);
1665 if (flat->type == BINDER_TYPE_FD) {
1666 // will need to rescan because we may have lopped off the only FDs
1667 mFdsKnown = false;
1668 }
1669 release_object(proc, *flat, this);
1670 }
1671 binder_size_t* objects =
1672 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
1673 if (objects) {
1674 mObjects = objects;
1675 }
1676 mObjectsSize = objectsSize;
1677 mNextObjectHint = 0;
1678 }
1679
1680 // We own the data, so we can just do a realloc().
1681 if (desired > mDataCapacity) {
1682 uint8_t* data = (uint8_t*)realloc(mData, desired);
1683 if (data) {
1684 LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity,
1685 desired);
1686 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1687 gParcelGlobalAllocSize += desired;
1688 gParcelGlobalAllocSize -= mDataCapacity;
1689 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1690 mData = data;
1691 mDataCapacity = desired;
1692 } else if (desired > mDataCapacity) {
1693 mError = NO_MEMORY;
1694 return NO_MEMORY;
1695 }
1696 } else {
1697 if (mDataSize > desired) {
1698 mDataSize = desired;
1699 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1700 }
1701 if (mDataPos > desired) {
1702 mDataPos = desired;
1703 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1704 }
1705 }
1706
1707 } else {
1708 // This is the first data. Easy!
1709 uint8_t* data = (uint8_t*)malloc(desired);
1710 if (!data) {
1711 mError = NO_MEMORY;
1712 return NO_MEMORY;
1713 }
1714
1715 if(!(mDataCapacity == 0 && mObjects == NULL
1716 && mObjectsCapacity == 0)) {
1717 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
1718 }
1719
1720 LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired);
1721 pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
1722 gParcelGlobalAllocSize += desired;
1723 gParcelGlobalAllocCount++;
1724 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock);
1725
1726 mData = data;
1727 mDataSize = mDataPos = 0;
1728 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize);
1729 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos);
1730 mDataCapacity = desired;
1731 }
1732
1733 return NO_ERROR;
1734 }
1735
initState()1736 void Parcel::initState()
1737 {
1738 LOG_ALLOC("Parcel %p: initState", this);
1739 mError = NO_ERROR;
1740 mData = 0;
1741 mDataSize = 0;
1742 mDataCapacity = 0;
1743 mDataPos = 0;
1744 ALOGV("initState Setting data size of %p to %zu", this, mDataSize);
1745 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos);
1746 mObjects = NULL;
1747 mObjectsSize = 0;
1748 mObjectsCapacity = 0;
1749 mNextObjectHint = 0;
1750 mHasFds = false;
1751 mFdsKnown = true;
1752 mAllowFds = true;
1753 mOwner = NULL;
1754 }
1755
scanForFds() const1756 void Parcel::scanForFds() const
1757 {
1758 bool hasFds = false;
1759 for (size_t i=0; i<mObjectsSize; i++) {
1760 const flat_binder_object* flat
1761 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]);
1762 if (flat->type == BINDER_TYPE_FD) {
1763 hasFds = true;
1764 break;
1765 }
1766 }
1767 mHasFds = hasFds;
1768 mFdsKnown = true;
1769 }
1770
1771 // --- Parcel::Blob ---
1772
Blob()1773 Parcel::Blob::Blob() :
1774 mMapped(false), mData(NULL), mSize(0) {
1775 }
1776
~Blob()1777 Parcel::Blob::~Blob() {
1778 release();
1779 }
1780
release()1781 void Parcel::Blob::release() {
1782 if (mMapped && mData) {
1783 ::munmap(mData, mSize);
1784 }
1785 clear();
1786 }
1787
init(bool mapped,void * data,size_t size)1788 void Parcel::Blob::init(bool mapped, void* data, size_t size) {
1789 mMapped = mapped;
1790 mData = data;
1791 mSize = size;
1792 }
1793
clear()1794 void Parcel::Blob::clear() {
1795 mMapped = false;
1796 mData = NULL;
1797 mSize = 0;
1798 }
1799
1800 }; // namespace android
1801